The trick here is that with heat pumps, they aren't generating the heat, just moving it. As such, you can have, e.g. a 1 kW heat pump moving much more than 1 kW

The trick here is that with heat pumps, they aren't generating the heat, just moving it. As such, you can have, e.g. a 1 kW heat pump moving much more than 1 kW of heat. Wheras with a resistive heater, the best you can do is turn 1 kW of electric power into 1 kW of heat output.